Abstract
The impact of Oulema melanopus (L.) larvae on grain yields of oats was investigated in the field at New Carlisle, Indiana, in 1966 and 1968. A gradient of larval population levels was established by using varying rates of malathion in spray applications. A regression analysis of the data showed that a cereal leaf beetle larva completing development to pupation consumed 20% of the leaf surface of I stem. However, the degree of loss in yield this amount of feeding caused was influenced by the stage of development of the crop. Loss in yield ranged from 2.29 to 4.10 bushels per acre per larva per stem infestation. When infestation occurred in the 2- to 3-inch seedling stage, highest losses per larva per stem occurred. Comparable infestations caused less loss in yield when the crop had attained 6 inches of vigorous growth before it became infested.
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